Question about 2005 Ford F-150

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Tac indicator light came on what is this

Indicator light came indicating ''TAC''

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  • jkgau Mar 13, 2009

    thanks for the effort



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That is the Throttle Actuator Control (TAC). This could be many things really, hard to say without knowing a code. You may want to see if you can run it by somewhere to pull which codes are popping up to make this light come on.

Posted on Mar 12, 2009


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Location of the cruise control fuse on a 2008 chevy Silverado 1500 5.3 engine

No fuse
The body control module (BCM) monitors the signal circuit of the cruise control switches. The BCM relays the cruise control switch status to the engine control module (ECM) via the GMLAN serial data circuit. The ECM uses the status of the cruise control switch to determine when to capture and maintain the vehicle speed. The ECM monitors the vehicle speed signal circuit in order to determine the desired vehicle speed. The ECM uses the throttle actuator control (TAC) motor in order to maintain the vehicle speed. For further information on the TAC System, refer to Throttle Actuator Control (TAC) System Descriptionfor the 4.3L engine or Throttle Actuator Control (TAC) System Description for the 4.8L, 5.3L, 6.0L, 6.2L or 7.0L engines.

Voltage is supplied to the cruise control switch via the steering wheel control switch reference voltage circuit supplied by the BCM.

Does the light come on ?

DTC P0575: Cruise Control Switch Signal Circuit
DTC B3794 08: Cruise Control Function Request Circuit Signal Invalid
DTC B3794 61: Cruise Control Function Request Circuit Actuator Stuck
DTC B0835 00: Cruise Control System Active Indicator Circuit
The cruise control switch contains an LED that illuminates to indicate the cruise control system has been switched ON. Voltage is applied through the ON/OFF switch to the LED when the switch is pressed. The body control module (BCM) provides the ground path for the LED through a dedicated LED control circuit. Pressing the switch again opens the switch and the lamp turns OFF.
DTC P0571: Cruise Control Brake Switch Circuit
DTC P0703: Brake Switch Circuit

Your best bet , take it to a qualified repair shop .

Feb 11, 2018 | Chevrolet Silverado Cars & Trucks

1 Answer

2008 Expedition 5.4l codes: P0607, P2004, P2107, U1900, B1676.

P0607 - Control Module Performance Description: Indicates that the powertrain control module (PCM) internal central processing unit (CPU) has encountered an error. The PCM monitors itself and carries out internal checks of its own CPU. If any of these checks returns an incorrect value, the DTC is set. Possible Causes:
  • Module programming error
  • Aftermarket performance products
  • Damaged PCM
Diagnostic Aids: Application Key On Engine Off Key On Engine Running Continuous Memory All Reprogram or update the calibration. Check for other DTCs or drive symptoms for further action. Make sure to check for aftermarket performance products before installing a new PCM. If it is necessary to install a new PCM, refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) .
P2004 - Intake Manifold Runner Control (IMRC) Stuck Open (Bank 1) Description: This DTC is set when the IMRC is commanded closed, but the IMRC monitor indicates open. This DTC replaces P1518 and P1537. Possible Causes:
  • IMRC monitor signal circuit shorted to PWR GND or SIG RTN
  • Damaged IMRC actuator or solenoid
  • Blocked vacuum hoses
Diagnostic Aids: Monitor the IMRC and IMRCM PIDs. The IMRCM state should change when the IMRC is commanded open or closed. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to Pinpoint Test HU .
P2107 - Throttle Actuator Control (TAC) Module Processor Description: The electronic throttle control (ETC) area of the powertrain control module (PCM) failed the self-test. The concern could be the result of an incorrect throttle position (TP) command, or TAC motor wires shorted together. Possible Causes:
  • TAC motor wire shorted together
  • TAC motor circuit wires short to PWR
  • Damaged electronic throttle body (ETB)
  • Damaged PCM
Diagnostic Aids: A TAC motor circuit PID reading may indicate a concern, if available. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to Pinpoint Test DV .
B1676 Battery Pack Voltage Out of Range ABS Module REFER to Section 206-09 . U1900 CAN Communication Bus Fault - Receive Error Power Running Board Module REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error RCM REFER to Section 418-00 .

Nov 25, 2017 | Cars & Trucks

2 Answers


Usually requires a new throttle actuator which may only be available as part of a throttle body assembly

Aug 27, 2016 | 2004 Isuzu Ascender

3 Answers

Engine power loss message

You need to have it checked for DTC'S - diagnostic trouble codes , There is a problem with throttle actuator control (TAC) - electronic throttle control !
Throttle Actuator Control (TAC) Overview
The throttle actuator control (TAC) system uses vehicle electronics and components to calculate and control the position of the throttle blade. This eliminates the need for a mechanical cable attachment from the accelerator pedal to the throttle body. This system also performs the cruise control functions as well.
The TAC system components include, but are not limited to the following:
The accelerator pedal position (APP) sensors

The throttle body

The powertrain control module (PCM)
Each of these components interface together to ensure accurate calculations and control of the throttle position (TP).

Drive by Wire Function and Diagnostics by Wells

Mar 29, 2015 | Cars & Trucks

1 Answer

Engine won't start and shows trouble code P1516 and reduced engine power light is on

Here is the definition of the code.

Possible causes - Faulty Throttle Actuator Control (TAC) module
- Throttle Actuator Control (TAC) module harness is open or shorted
- Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires)

P1516 CHEVROLET Description The Throttle Actuator Control (TAC) module contains data which is essential for proper TAC operation. The TAC module continuously test the integrity of this data. When the TAC module is unable to write or read data to and from Random Access Memory (RAM), or the TAC module is unable to correctly read data from the flash memory or and internal TAC module processor fault is detected and the Detected Trouble Code (DTC) is set.
Read more:

Sep 28, 2012 | 2002 Chevrolet TrailBlazer

2 Answers

I have codes: po455, po123. po406 po606.p2104, po2106, p2110, & p2135 help please!

(so i cleared the code..all was fine.) No it wasn't ,you don't just clear code's without doing the diagnostic's for that code . It's just a matter of time ,when the PCM/ECM - engine computer runs that test again, that light will come back on. P0455 is a large leak in the evaporative emission system .Sorry dude but you don't stand a snow ball's chance in guam of fixing this .
Do you know what electronic throttle control is ?
P2135 - ETC Throttle Position (TP) Sensor A/B Voltage Correlation Description: The powertrain control module (PCM) flagged a fault indicating that TP1 and TP2 disagree, or that TP1 should not be in the present position given the position of TP2 unless a concern is present. Possible Causes:
  • TP sensor shorted internally to VREF.
  • TP sensor harness is shorted to power.
  • TP sensor signal wires are shorted together.
  • Damaged TP sensor.
Diagnostic Aids: Compare the TP1 and TP2 PID values for a full sweep and correlation. Refer to the chart in pinpoint test DV. GO to Pinpoint Test DV .
Compare TP1 and TP2 PID values to the typical reference values in Section 6 . Application Key On Engine Off Key On Engine Running Continuous Memory All GO to DV4
P2110 - Throttle Actuator Control (TAC) System - Forced Limited RPM Description: The TAC system is in the failure mode effects management (FMEM) mode of forced limited RPM. Possible Causes:
  • Cross-wired TAC motor.
  • Damaged powertrain control module (PCM).
Diagnostic Aids: This DTC indicates only that the FMEM condition exists, and can be set in combination with DTCs P2100, P2101, or P2107, meaning the electronic throttle body (ETB) faults should be diagnosed first. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to QE1
Do yourself a favor an take it to a qualified repair shop.

Nov 08, 2017 | 2005 Mercury Mountaineer

1 Answer

Waht ist tha p1516

DTC P1516 - Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance


Circuit Description (click over pic for zoom)
The commanded throttle position, based on accelerator pedal position and possibly other limiting factors, is compared to the Actual throttle position. The 2 values should be within a calibrated range of each other. Both the PCM and the TAC module redundantly monitor the Commanded and Actual throttle position. This DTC sets if the TAC module detects the problem.

Conditions for Setting the DTC
1. DTC P1518 is not set.
2. The ignition switch is in the crank or run position.
3. The ignition voltage is greater than 5.23 volts.
4. Not in battery saver mode.
5. The TAC module detects that the commanded and actual throttle positions are not within a calibrated range of each other or the PCM and the TAC cannot determine throttle position or both TP sensors are invalid.
6. All above conditions met for less than 1 second.

Action Taken When the DTC Sets
1. The PCM will illuminate the Malfunction Indicator Light (MIL) when this diagnostic runs and fails.
2. The Reduced Engine Power message displays on the drivers information center.
3. The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Freeze Frame and/or Failure Records.
4. If no other TAC System DTCs are set, the TAC System will operate in Reduced Engine Power mode. If certain TAC System DTCs are set at the same time, the TAC System either defaults to a more tightly restricted mode of operation if the TAC determines that limited safe operation is possible, or the TAC commands the engine to shut down.

Conditions for Clearing the MIL/DTC
1. The PCM turns the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.
2. A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.
3. A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
4. The PCM battery voltage is interrupted.
5. Important
* The clear DTC info function may have to be performed twice in order to clear a Throttle Actuator Control System DTC.
* Clear the MIL/DTC information using a scan tool.

Diagnostic Aids
The following may cause an intermittent:
1. Poor connections. Check for adequate terminal tension. Refer to Troubleshooting Procedures, Checking Terminal Contact (Body and Accessories/Wiring Systems) for proper procedure.
2. Corrosion
3. Mis-routed harness
4. Rubbed through wire insulation
5. Broken wire inside the insulation
6. Inspect the TAC module connectors for signs of water intrusion. When this occurs, multiple DTCs should be set and no circuit or component problems can be located.

1. For an intermittent condition refer to Symptoms .
2. If a repair is completed and the DTC was cleared using a scan tool on the same ignition cycle, the default action will not clear until an ignition cycle has occurred.
3. When the TAC module detects a problem within the TAC System, more than one TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual problem may correct more than one DTC. Keep this in mind when reviewing captured DTC info.

Test Description
The numbers below refer to the step numbers on the diagnostic table.

5. If the TP Indicated Angle does not follow the movement of the throttle blade, and no TP Sensor DTCs are set, there is a mechanical problem with the throttle shaft or the TP Sensor. Replace the throttle body assembly. Re-install the air inlet duct after you complete the repairs.

21. When a problem is detected within the TAC System, more than one TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. It is possible that locating and repairing one individual problem may correct more than one DTC. Keep this in mind when reviewing captured DTC info.







Hope helps.

Feb 10, 2011 | Chevrolet Malibu Cars & Trucks

1 Answer

Check engine lights are on

"U" codes indicate a network communications problem
could be in the wiring and harness connections between the sensor and the ECM or CPU program
2107 concerns the throttle actuator control (TAC) module --processor fault ===causes --TAC control module
check wiring and all connections

Jun 04, 2017 | 2002 Saturn VUE

1 Answer

Have a code on my 2007 ford fusion sel code p2111 TAC do you know what that is and what do i do to fix it. it would dont accellerate until i turned the motor off and turned back on. now it is ok still have...

P2111 PCM indicates the throttle plate is at a greater angle then commanded.

Possible causes:
- Binding in the Throttle Body, Stuck open,
- TAC Motor circuit are cross wired
- TAC Motor harness circuits are shorted together
- Damaged PCM unit.

Hope help with this.

Apr 19, 2010 | 2007 Ford Fusion I4 SEL Sedan

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